I think you'll be hard pressed to find info on this conversion, as far as I know you're the first one to attempt it.

For the bellhousing, the 4JB1 uses a plate bolted to the back of the block, so it would just be a matter of making a new plate with the correct bolt pattern to get the trans to bolt up. Then figuring out the clutch or torque converter setup. If you have a manual trans, I think adapting the trans would be (relativly) easy. It would not be for the novice, but it sounds like you have the tools to do it.

The exhaust on the 4JB1 is on the passenger side of the engine. You would have to eleminate the cat. converter, and as far as the muffler, a muffler is a muffler. For the most part. What I mean is there is no specific "gas only" or "diesel only" mufflers.

I don't think you could go wrong with the 4JB1. They are direct injected (which is a good thing), and have tons of power in stock form, with tons more waiting to be unleashed with some tuning of the injection pump, turbo, etc. All free stuff, just some adjusting required. I am in the process of doing this on mine. I have only turned it up a little, and the power gain is unreal; like breaking the tires loose on a wet road as soon as it starts to build boost in 3rd gear!!!! I have only lost 2 mpg (down to 28) since turning it up, but I think that is because my right foot is a bit heaver now <img src="/forums/images/graemlins/smile.gif" alt="" />

One thing to watch though, is the 4JB1 is a tall engine. Especially with the top mounted intercooler. I had to put a body lift on my 82 Pup to get the hood to close.